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Created page with "{{Night Sky | image = | designation =Gum 12a | rightascension =07<sup>h</sup> 53<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gum..."
{{Night Sky
| image =
| designation =Gum 12a
| rightascension =07<sup>h</sup> 53<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gum+nebula&submit=submit+id Gum nebula] from simbad.u-strasbg.fr</ref>
| declination =-42° 06′<ref name=simbad/>
| distance =1,300 ly<ref name=mitra>Ramachandran, R.; Mitra, D., 2001. Scatter broadening of pulsars in the direction of the Gum nebula. ''Astronomy and Astrophysics'', [Online]. 370, 586-590. Available at: https://www.aanda.org/component/article?access=bibcode&bibcode=&bibcode=2001A%2526A...370..586MFUL (Accessed 18 January 2018).</ref>
| constellation =Puppis
| type =Emission nebula
| dimensions =35° across<ref name=britannica>[https://www.britannica.com/place/Gum-Nebula Gum Nebula] from britannica.com</ref>
| magnitude =Apparent Mag: >6
| redshift =
| radvelocity =
| propmotion =
| parallax =
}}
The '''Gum nebula''' (Gum 12a) is a large [[emission nebula]] in the [[constellation]]s of [[Puppis]] and [[Vela]].<ref name=britannica/> A complex cloud of [[gas]], it is the largest emission nebula on the night sky, measured by its apparent size of 35°.<ref name=britannica/> This large size actually makes it difficult to see or photograph. Photographs of the nebula are normally made from a mosaic of zoomed in photographs. The nebula was discovered by the Australian astrophysicist Colin S. Gum whilst working at the Mount Stromlo Observatory in [[Australia]]<ref>[http://galaxymap.org/cat/list/gum/11 The Gum Catalog] from galaxymap.org</ref> Gum gave the nebula the designation Gum 12a in his catalogue, the Gum Catalgoue, which is still in use today. It has been proposed that is the remnant of a [[supernova]].<ref name=britannica/> The [[Vela supernova|Vela supernova remnant]] is contained within this nebula.<ref name=nasa>[https://apod.nasa.gov/apod/ap060519.html The Gum Nebula] from apod.nasa.gov</ref>
==Properties and Structure==
At 35° across, the Gum nebula is by far the largest emission nebula known and covers an area of sky several times that of the [[Moon]]. It's distance of some 1,300 [[light year]]s means that is is roughly 1,000 light years across.<ref name=britannica/> The radiation emitted by two stars located within the nebula, ζ Puppis and γ<sup>2</sup> Velorum, caused the [[hydrogen]] [[gas]] in the nebula to glow.<ref name=mitra/> The gas in the nebula has a [[density]] of around 2 particles cm<sup>-3</sup>.<ref name=mitra/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]
| image =
| designation =Gum 12a
| rightascension =07<sup>h</sup> 53<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gum+nebula&submit=submit+id Gum nebula] from simbad.u-strasbg.fr</ref>
| declination =-42° 06′<ref name=simbad/>
| distance =1,300 ly<ref name=mitra>Ramachandran, R.; Mitra, D., 2001. Scatter broadening of pulsars in the direction of the Gum nebula. ''Astronomy and Astrophysics'', [Online]. 370, 586-590. Available at: https://www.aanda.org/component/article?access=bibcode&bibcode=&bibcode=2001A%2526A...370..586MFUL (Accessed 18 January 2018).</ref>
| constellation =Puppis
| type =Emission nebula
| dimensions =35° across<ref name=britannica>[https://www.britannica.com/place/Gum-Nebula Gum Nebula] from britannica.com</ref>
| magnitude =Apparent Mag: >6
| redshift =
| radvelocity =
| propmotion =
| parallax =
}}
The '''Gum nebula''' (Gum 12a) is a large [[emission nebula]] in the [[constellation]]s of [[Puppis]] and [[Vela]].<ref name=britannica/> A complex cloud of [[gas]], it is the largest emission nebula on the night sky, measured by its apparent size of 35°.<ref name=britannica/> This large size actually makes it difficult to see or photograph. Photographs of the nebula are normally made from a mosaic of zoomed in photographs. The nebula was discovered by the Australian astrophysicist Colin S. Gum whilst working at the Mount Stromlo Observatory in [[Australia]]<ref>[http://galaxymap.org/cat/list/gum/11 The Gum Catalog] from galaxymap.org</ref> Gum gave the nebula the designation Gum 12a in his catalogue, the Gum Catalgoue, which is still in use today. It has been proposed that is the remnant of a [[supernova]].<ref name=britannica/> The [[Vela supernova|Vela supernova remnant]] is contained within this nebula.<ref name=nasa>[https://apod.nasa.gov/apod/ap060519.html The Gum Nebula] from apod.nasa.gov</ref>
==Properties and Structure==
At 35° across, the Gum nebula is by far the largest emission nebula known and covers an area of sky several times that of the [[Moon]]. It's distance of some 1,300 [[light year]]s means that is is roughly 1,000 light years across.<ref name=britannica/> The radiation emitted by two stars located within the nebula, ζ Puppis and γ<sup>2</sup> Velorum, caused the [[hydrogen]] [[gas]] in the nebula to glow.<ref name=mitra/> The gas in the nebula has a [[density]] of around 2 particles cm<sup>-3</sup>.<ref name=mitra/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]